Why do spaceships rotate around the globe before they head to space?
“Orbit” is a place where the angular momentum of an object or its tangential velocity around a much larger object counteracts its tendency to fall straight toward the centre of such larger object. Spaceships would require hundreds of times the necessary fuel load to blast straight through the Earth’s gravitational field and they would have to keep those rockets firing just to stay there, otherwise Earth’s overwhelming gravity would tug them straight back down the way they came. When a spaceship climbs with a gentle curve into a tangential orbital path, most of the energy invested getting up there is saved, as tangential velocity in frictionless space. When the spaceship is “parked” in orbit, the inevitable fall back to Earth conveniently pulls the tangential path back toward the ground, preventing an uncontrolled slingshot-like path into outer space. BTW the same thing applies for re-entry. It’s WAY safer to re-enter the atmosphere in a decaying orbit at as shallow an angle as possible
